In reply to mondite:
> Can they try appealing it further or is it game over.
In theory they can apply to the Supreme Court. If I understand correctly, they would have to get permission from the Court of Appeal to apply. They could do so on the basis that this is a point of law of general public importance which ought to be heard by the Supreme Court. However the CoA's judgement was that this turned on "a perfectly natural use of language" and they would have to make a very strong case that this was an incorrect approach.
Plenty of people go camping for its own sake, not merely as part of another activity, and the walk may simply be to get to a place to camp, rather than the camp facilitating the walk as the first judge thought. The "natural use of language" argument seems entirely reasonable to me. I guess we'll see, but I would be disappointed and surprised if they manage to appeal, and even more surprised if they succeed.
This decision is important not only for Dartmoor but because it provides legal confirmation that camping is part of outdoor recreation. Should the question ever arise whether a different outdoor activity is "outdoor recreation" the natural use of language basis established in this case might well be the basis for deciding it.